#include<iostream>
using namespace std;
//void test_string()
//{
//	string a1("hello world!");
//	string a2 = "hello world!";
//	
//	cout << a1 << endl;
//	cout << a2 << endl;
//}
int main()
{
	
	/*string a1 = "I love yinxinyi ";
	cout << a1.size() << endl;
	cout << a1.length() << endl;*/



	string a1 = "I love yinxinyi";
	for (int i = 0; i < a1.size(); i++)
	{
		cout << a1.operator[](i);
	}
	cout << endl;
	for (int j = 0; j < a1.size(); j++)
	{
		cout << ++a1[j];
	}
	return 0;
}
